Initial patch for a64.

src/sampler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 58 matching lines @@
 
 #if defined(__ANDROID__) && !defined(__BIONIC_HAVE_UCONTEXT_T)
 
 // Not all versions of Android's C library provide ucontext_t.
 // Detect this and provide custom but compatible definitions. Note that these
 // follow the GLibc naming convention to access register values from
 // mcontext_t.
 //
 // See http://code.google.com/p/android/issues/detail?id=34784
 
+// TODO(jbramley): This is not (and has never been) defined for A64. Does A64's
+// Android provide ucontext_t? Should we add an A64 variant?
+
 #if defined(__arm__)
 
 typedef struct sigcontext mcontext_t;
 
 typedef struct ucontext {
   uint32_t uc_flags;
   struct ucontext* uc_link;
   stack_t uc_stack;
   mcontext_t uc_mcontext;
   // Other fields are not used by V8, don't define them here.
@@ skipping 150 matching lines @@
     // Check if there is active simulator before allocating TickSample.
     if (!simulator_) return NULL;
 #endif  // USE_SIMULATOR
     TickSample* sample = isolate->cpu_profiler()->TickSampleEvent();
     if (sample == NULL) sample = &sample_obj;
     return sample;
   }
 
 #if defined(USE_SIMULATOR)
   inline void FillRegisters(TickSample* sample) {
+#if V8_TARGET_ARCH_ARM
     sample->pc = reinterpret_cast<Address>(simulator_->get_pc());
     sample->sp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::sp));
-#if V8_TARGET_ARCH_ARM
     sample->fp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::r11));
+#elif V8_TARGET_ARCH_A64
+    sample->pc = reinterpret_cast<Address>(simulator_->pc());
+    sample->sp = reinterpret_cast<Address>(simulator_->sp());
+    sample->fp = reinterpret_cast<Address>(simulator_->lr());
 #elif V8_TARGET_ARCH_MIPS
+    sample->pc = reinterpret_cast<Address>(simulator_->get_pc());
+    sample->sp = reinterpret_cast<Address>(simulator_->get_register(
+        Simulator::sp));
     sample->fp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::fp));
 #endif
   }
 #endif  // USE_SIMULATOR
 
  private:
 #if defined(USE_SIMULATOR)
   Simulator* simulator_;
 #endif
@@ skipping 85 matching lines @@
   // values from mcontext_t.
   sample->pc = reinterpret_cast<Address>(mcontext.gregs[R15]);
   sample->sp = reinterpret_cast<Address>(mcontext.gregs[R13]);
   sample->fp = reinterpret_cast<Address>(mcontext.gregs[R11]);
 #else
   sample->pc = reinterpret_cast<Address>(mcontext.arm_pc);
   sample->sp = reinterpret_cast<Address>(mcontext.arm_sp);
   sample->fp = reinterpret_cast<Address>(mcontext.arm_fp);
 #endif  // defined(__GLIBC__) && !defined(__UCLIBC__) &&
         // (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+#elif V8_HOST_ARCH_A64
+  sample->pc = reinterpret_cast<Address>(mcontext.pc);
+  sample->sp = reinterpret_cast<Address>(mcontext.sp);
+  // FP is an alias for x29.
+  sample->fp = reinterpret_cast<Address>(mcontext.regs[29]);
 #elif V8_HOST_ARCH_MIPS
   sample->pc = reinterpret_cast<Address>(mcontext.pc);
   sample->sp = reinterpret_cast<Address>(mcontext.gregs[29]);
   sample->fp = reinterpret_cast<Address>(mcontext.gregs[30]);
 #endif  // V8_HOST_ARCH_*
 #elif defined(__FreeBSD__)
 #if V8_HOST_ARCH_IA32
   sample->pc = reinterpret_cast<Address>(mcontext.mc_eip);
   sample->sp = reinterpret_cast<Address>(mcontext.mc_esp);
   sample->fp = reinterpret_cast<Address>(mcontext.mc_ebp);
@@ skipping 314 matching lines @@
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 void Sampler::SampleStack(TickSample* sample) {
   sample->Trace(isolate_);
   if (++samples_taken_ < 0) samples_taken_ = 0;
 }
 
 } }  // namespace v8::internal